Science Questions
Explore questions in the Science category that you can ask Spark.E!
A typical galaxy is a _________.A. system consisting of one or a few stars orbited by planets, moons, and smaller objectsB. relatively small, icy object orbiting a starC. large, glowing ball of gas powered by nuclear energyD. collection of a few hundred million to a trillion or more stars, bound together by gravityE. nearby object orbiting a planet
On a scale where the Sun is about the size of a grapefruit and the Earth is about 15 meters away, how far away are the nearest stars besides the Sun?A. 100 metersB. About the distance across 50 football fieldsC. About the distance across the state of DelawareD. About the distance across the United States
What do astronomers mean by a constellation? A. A constellation is any random grouping of stars in the sky.B. A constellation is a region in the sky as seen from Earth.C. A constellation is a group of stars related through an ancient story.D. A constellation is a group of stars that are all located in about the same place in space.
What is the ecliptic plane?A. The plane of Earth's equatorB. The plane of the Milky Way GalaxyC. The plane of the Sun's equatorD. The plane of Earth's orbit around the Sun
Our solar system consists of _________.A. the Sun and several nearby stars, as well as the planets and other objects that orbit these starsB. the Sun and the planets, and nothing elseC. the Sun and all the objects that orbit itD. a few hundred billion stars, bound together by gravity
About how many stars are visible to the naked eye on a clear, dark night away from city lights?A. A few hundred billionB. A couple thousandC. A few dozenD. Several million
The number of stars in the Milky Way Galaxy is approximately _________.A. a few hundred billionB. a few hundred millionC. a few hundred thousandD. a few hundred
What is the ecliptic?A. The path the Sun appears to trace around the celestial sphere each yearB. The path traced by the Moon's shadow on Earth during a solar eclipseC. The Sun's daily path from east to west in our skyD. A half-circle extending from your horizon due north, through your zenith, to your horizon due south
Which of the following best describes what we mean by the universe?A. The universe is another name for our Milky Way Galaxy.B. The sum total of all matter and energyC. A vast collection of stars that number as many as the grains of sand on all the beaches on EarthD. All the galaxies in all the superclusters
Based on observations of the universal expansion, the age of the universe is about _________.A. 14 trillion yearsB. 14,000 yearsC. 14 billion years D. 14 million years
What do we mean when we say that the universe is expanding?A. Average distances between galaxies are increasing with time.B. Everything in the universe is gradually growing in size.C. The statement is not meant to be literal; rather, it means that our knowledge of the universe is growing.D. Within galaxies, average distances between star systems are increasing with time.
An astronomical unit (AU) is _________.A. the current distance between Earth and the SunB. the average distance between any planet and the SunC. any very large unit, such as a light-yearD. the average distance between Earth and the Sun
A light-year is _________.A. about 300,000 kilometers per secondB. the time it takes light to reach the nearest starC. about 10 trillion kilometersD. the time it takes light to travel around the Sun
What do astronomers mean by the Big Bang?A. The event that marked the beginning of the expansion of the universeB. A gigantic explosion that blew all the galaxies in the universe to smithereensC. The explosion of a massive star at the end of its lifeD. The event that marked the birth of our solar system
A television advertisement claiming that a product is light-years ahead of its time does not make sense because _________.A. a light-year is an astronomically large unit, so a product could not possibly be so advancedB. light-years can only be used to talk about lightC. it doesn't specify the number of light-yearsD. it uses "light-years" to talk about time, but a light-year is a unit of distance
How long does it take the Earth to complete one orbit around the Sun?A. One weekB. One dayC. One yearD. One monthE. The time it takes Earth to orbit the Sun changes significantly from one orbit to the next.
The term observable universe refers to _________.A. the portion of the universe that can be seen by the naked eyeB. that portion of the universe that we have so far photographed through telescopesC. that portion of the universe that we can see in principle, given the current age of the universeD. the portion of the universe that is not hidden from view by, for example, being below the horizon
Which of the following is not a general difference between a planet and a star?A. Planets orbit stars, while stars orbit the center of the galaxy.B. All planets are made of rock and all stars are made of gas.C. Planets are dimmer than stars.D. Planets are smaller than stars.
On a scale in which the distance from Earth to the Sun is about 15 meters, the distance from Earth to the Moon is _________.A. about 5 metersB. about 30 metersC. about 1 meterD. small enough to fit within your hand
La quatrième couche peux avoir un maximum de combien d'électrons